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INVENTORIES
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
INVENTORIES
4.
INVENTORIES
 
Inventories are stated at the lower of cost, determined either on the first-in, first-out or average cost method, or market. The cost of manufactured inventory includes raw material, labor and overhead. Inventories, net of reserves, consist of the following (in thousands):
 
 
 
March 31,
 
December 31,
 
 
 
2018
 
2017
 
Raw materials and components
 
$
102,405
 
$
83,834
 
Finished goods
 
 
95,831
 
 
54,000
 
Work in progress
 
 
28,198
 
 
29,123
 
Aftermarket parts
 
 
5,998
 
 
6,448
 
Used trailers
 
 
4,283
 
 
7,330
 
 
 
$
236,715
 
$
180,735